i have 5 systems all running the below hardware and software. why is that even though my cards are all stable at 970 clock and 185 mem they all produce different values, and i dont just mean between cards, i mean as a system whole. the speeds of each system are below, but i want them all to run at above 400, but having issues:

system 2card 1 - 380card 2 - 380card 3 - 380card 4 - 380 (this card is a refference card, when run on a stand alone system i get 440 mh no problems)

system 3card 1 - 400card 2 - 400card 3 - 400card 4 - 390

system 4card 1 - 370card 2 - 370card 3 - 380card 4 - 400

system 5card 1 - 420card 2 - 420card 3 - 420card 4 - 420

so yes there are differences between each card, but systems as a whole have the notable differences. even my refference card only gets 380 mh and as explained ive got 440 out of this on a stand alone system.

It might be the hardware's component's tolerances coming into play rather noticeably, since you have a lot of identical systems set up.

If you don't know what I'm talking about: All electronic components have tolerances that they operate under, since it's very hard to make them perfectly. Take a 68 Ohm resistor with a 5% tolerance. This means that it'll have a resistance of 68 * +-.05 when measured, giving it a range of 64.6 resistance to 71.4 Ohm resistance. What's happening in your systems might be that the processors, GPU, RAM, HDD, mobo have tolerances that they operate under, and they're adding up and being easily found since you have so many samples to look at.

It's not uncommon for identical electrical systems to run differently. That's why you see computer advertised with hardware, rather than benchmarks (eg 3.0GHz process rather than "opens firefox in 1 second").

i checked the clocks, they are different for each system, as some run stable at lower speeds. I cant change the individual clocks as they start crashing :S My psu is an OCZ 1250w, i dont think power is an issue, its either processor bottlenecking or something else?

OCZ isn't exactly known for providing top quality psu's. That said, I would say it's the tolerances taking effect as mentioned earlier. No two pieces of equipment will perform the same regardless if they're the same model.